Figure 2. Chlorine content (atoms per formula unit) versus Dpar (etch figure size) for (A) FT age grains and (B) FT length measurements for the East MacKay I-77 FT sample. Solid black lines are derived from published equations of Ketcham et al. (1999) (their Fig. 7). Solid red lines are from the reduced major axis (RMA) regression of the plotted data (x symbols). For the RMA line, a Cl value of 0.125 apfu equates with a Dpar value of 2.